Ivashchenko et al. [73] observed that patients with HTR2A (rs6313) C allele (42.1 vs. 0%, p = 0.003), but also patients with DRD2 (rs1800497) T allele, more often complained of tremor (50 vs. 21.6%, p = 0.039). The gene discussed is DRD2; the disease is Tremor.